<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>IE缓存问题</title>
    <style>
      #result {
        width: 200px;
        height: 100px;
        border: solid 1px #258;
      }
    </style>
  </head>
  <body>
    <button>点击发送请求</button>
    <div id="result"></div>
    <script>
      const btn = document.getElementsByTagName('button')[0]
      const result = document.querySelector('#result')

      btn.addEventListener('click', function () {
        const xhr = new XMLHttpRequest()
        xhr.open('GET', 'http://127.0.0.1:8000/ie?t=' + Date.now())
        xhr.send()
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300) {
              result.innerHTML = xhr.response
            }
          }
        }
      })
    </script>
  </body>
</html>
